Perhaps you should try some spelling variations:
chiet tach » chieu sach
doi chiet » doi chieu, doi chi, doi viet
hanh tang » hanh trang, anh tang, hanh mang
hai trong » tai trong, bai trong, dai trong
tang hai » hang hai, tang tai, tang ha
cong dan » cong san, cong tan, huong dan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi chiet tach - hanh tang hai trong cong dan ((toan cao) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chiet tach - hanh tang hai trong cong dan ((toan cao) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: doi chiet tach - hanh tang hai trong cong dan ((toan cao) or (van ban))*.